feat(line): add line reading and spliting

Makefile

@@ -1,8 +1,10 @@
-OBJ=main.o
+OBJ=main.o line.o
 CC=gcc
 CFLAGS= -O3 -Wall
 
-all:dish
+all:debug
+
+release:dish
 
 dish: $(OBJ)
 	$(CC) $(CFLAGS) -o dish $(OBJ)

line.c

@@ -0,0 +1,87 @@
+#include "line.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *readLine(void) {
+  int bufsize = LINE_BUF_SIZE;
+  int position = 0;
+  char *buffer = malloc(sizeof(char) * bufsize);
+  char c;
+
+  if (!buffer) {
+    fprintf(stderr, "dish: allocation error\n");
+    exit(EXIT_FAILURE);
+  }
+
+  while (1) {
+    // read a character
+    c = getchar();
+    printf("%s", &c);
+    // repleace EOF with a null character and return
+    if (c == EOF || c == '\n') {
+      buffer[position] = '\0';
+      return buffer;
+    } else {
+      buffer[position] = c;
+    }
+    position++;
+
+    /* if the buffer is full, reallocate */
+    if (position >= bufsize) {
+      bufsize += LINE_BUF_SIZE;
+      buffer = realloc(buffer, bufsize);
+      if (!buffer) {
+        fprintf(stderr, "dish: allocation error\n");
+        exit(EXIT_FAILURE);
+      }
+    }
+  }
+}
+
+char **splitLine(char *line) {
+  int bufsize = LINE_BUF_SIZE, position = 0;
+  char **tokens = malloc(bufsize * sizeof(char *));
+  char *token;
+
+  if (!tokens) {
+    fprintf(stderr, "dish: allocation error");
+    exit(EXIT_FAILURE);
+  }
+
+  /* get sub string
+   *" \t\r\n\a" is a set of delimiters,
+   * which stands for space, tab, carriage, newline, and alert.
+   */
+  token = strtok(line, " \t\r\n\a");
+
+  while (token != NULL) {
+    tokens[position] = token;
+    position++;
+
+    /* if the buffer is full, reallocate */
+    if (position >= bufsize) {
+      bufsize += LINE_BUF_SIZE;
+      tokens = realloc(tokens, bufsize);
+      if (!tokens) {
+        fprintf(stderr, "dish: allocation error\n");
+        exit(EXIT_FAILURE);
+      }
+    }
+
+    token = strtok(NULL, " \t\r\n\a");
+  }
+
+  /* set the last element to NULL */
+  tokens[position] = NULL;
+  return tokens;
+}
+
+void line() {
+  char *line;
+  int status = 1;
+  char str;
+  printf("> ");
+  line = readLine();
+  free(line);
+}

line.h

@@ -0,0 +1,5 @@
+#ifndef _LINE_H_
+#define _LINE_H_
+#define LINE_BUF_SIZE 1024
+void line();
+#endif

main.c

@@ -19,8 +19,7 @@ int main(int argc, char *argv[]) {
   printf("DEBUG is defined\n");
 #endif
   while (1) {
-    printf("runing!\n");
-    sleep(1);
+    line();
   }
   return 0;
 }